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Статті в журналах з теми "Piston oil cooling"
1
Deng, Lijun, Yongqi Liu, Zhiming Wang, Shiying Liu, and Jian Zhang. "Optimization of the Location of the Oil Cooling Gallery in the Diesel Engine Piston." Open Mechanical Engineering Journal 10, no. 1 (June 13, 2016): 126–34. http://dx.doi.org/10.2174/1874155x01610010126.
Повний текст джерелаАнотація:
The oil cooling gallery is arranged at the top of the piston, which can effectively reduce the heat load of the piston. In this paper, finite element analysis and fatigue analysis by FE-safe are used to calculate the effects of the different positions of the oil cooling gallery to the temperature, stress field and the fatigue strength of the bowl rim, top land, first ring groove, second land and cooling gallery. The results show that, with the oil cooling gallery moving upward regularly, the temperature of the oil cooling gallery increased, and the temperature of other piston critical position decreased; but when the distance of the oil cooling gallery and combustion chamber decreased, the structural strength of the combustion chamber decreases gradually. In addition, too small distance between the oil cooling gallery and the top surface will make the temperature of the oil cooling gallery too high, which makes the oil coking in the oil cooling gallery, affecting the cooling effect seriously. For this type of piston, the optimal distance between the oil cooling gallery and the top surface is 12.5mm.
2
Gots, A. N., and S. A. Glinkin. "Analysis of methods for improvement of thermal stability of pistons of tractor diesel engines." Traktory i sel hozmashiny 83, no. 12 (December 15, 2016): 34–38. http://dx.doi.org/10.17816/0321-4443-66282.
Повний текст джерелаАнотація:
The article considers the applied methods for improving the thermal strength of pistons of internal combustion engines. Tractor diesels with combustion chamber in the piston have the greatest rate of temperature change at load rise and release, as well as the highest values of temperature gradients. The highest thermal loads occur in pistons with a semi-open combustion chamber. Periodic thermal loads with high value of temperature gradient lead to thermal fatigue fractures. Such fractures may begin with the appearance of cracks on the edge of combustion chamber. The presence even of a small crack on the edge of combustion chamber leads to its further growth, which can cause the destruction of piston. The main causes of cracks formation on the edge of combustion chamber are the alternating stresses induced from alternating gas pressure in cylinder during the working cycle; the low-frequency oscillations of the piston temperature arising from the changing of operation modes of engine; the high-frequency cyclical thermal oscillations caused by the temperature change of material in the surface layer of combustion chamber for each working cycle. The most common design and technology solutions improving the thermal strength of pistons are the following ones: the change of the edge radius of combustion chamber throat; the reinforcement of combustion chamber edge with more heat-resistant materials; the use of materials with high thermal stability for manufacture of pistons; the artificial heat insulation of piston or its cooling by oil. The disadvantage of use of cooling oil gallery is the acceleration of oil aging process. The alternative solution is to limit the heat supply to the walls of combustion chamber by means of heat protection coating applied by gas-flame, detonation or electric-arc way. The easiest way to improve the thermal strength of diesel piston with a semi-open combustion chamber is the design change.
3
Mukmin, Muhammad Amirul. "ANALISIS KEANDALAN DAN PENENTUAN PERSEDIAAN OPTIMAL SUKU CADANG COMPRESOR TWO STAGE FOR VESSEL IQF DENGAN METODE ABC DAN RELIABILITY DI PT.KELOLA MINA LAUT." MATRIK (Jurnal Manajemen dan Teknik) 17, no. 1 (December 27, 2017): 38. http://dx.doi.org/10.30587/matrik.v17i1.161.
Повний текст джерелаАнотація:
The Production process PT. Kelola Mina Laut has often had obstacles of not working operation of production systems ( production stop because of the problem at bottleneck or breakdown ). This happens because the breakage production machine or waiting for engine unit/component ordered and purchased to replace the faulty component. Especially on machine compressor two-stage no 6 for vessel IQF 4 So it required that the optimal inventory control of spare parts. The method used for the determination this component is the ABC classification method and the method Reliability. ABC obtained by the method of classification of class A that is a component Cylinder liner, piston, piston ring, water pump cooling kop and oil pump. From research to get the value of reliability and the optimal amount of spare parts that cylinder liner with 0.005566 reliability value and the rate of failure 0.012. component piston with the reliability value of 0.017 and the rate of failure 0.014. component piston ring with the reliability value of 0.069 and the rate of failure 0.003605. Component water pumps cooling kop with reliability value of 0.04 and the rate of failure 0.001933 and component Oil Pump with reliability value of 0.03 and the rate of failure 0.002274. Component count is required in a year on machine compressor two-stage no 6 for vessel IQF 4 is 4 units Cylinder liner,5 units of pistons, 1 unit piston ring, 1 unit water pump cooling kop and 1 unit oil pump. With this research can save maintenance costs amounting to 29.86% by a margin price of Rp 37,506,700.00
4
Xu, Qin Chao, Shu Zong Wang, and Yong Qing Lian. "Thermal Transfer Boundary Condition and Thermal Load of Piston for Torpedo Cam Engines." Materials Science Forum 704-705 (December 2011): 619–24. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.619.
Повний текст джерелаАнотація:
Piston of cam engines for torpedo works in terrible condition and always be caused fatigue breakdown by thermal load. In this paper, the thermal boundary condition of different piston parts are ascertained, such as the crown surface of piston and high-temp gas, the side of piston and cooling water, and the skirt of piston and cooling oil. Then the piston’s temperature field is obtained by using the finite element analysis software. This result provides the practical reference for further improving the structure and optimizing the design of the piston. Keywords: cam engine; piston; heat-transfer coefficient; temperature field.
5
Ning, Hai Qiang, Jin Sheng Dou, Xing Hua Huang, and Yuan Wen Xie. "Thermal Load Simulation and Structure Improvement of High Speed Diesel Engine Piston." Applied Mechanics and Materials 513-517 (February 2014): 2843–46. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.2843.
Повний текст джерелаАнотація:
In order to solve cylinder-scraping of a four-cylinder high speed diesel engine, based on the measurement of piston temperature, the piston temperature field was numerically simulated by using temperature fitting method, the calculation results were well consistent with the measured temperature. By finite element analysis of piston thermal load based on the calculation results as temperature load, enlarging oil cooling cavity in the piston head was proposed to enhance cooling locally, which could effectively reduce temperature of the piston head and the first ring groove and avoid the occurrence of cylinder-scraping.
6
Abramchuk, Fedor I., and Andrey N. Avramenko. "Prospects of Using Steel Pistons in Transport Diesel Engines." Periodica Polytechnica Transportation Engineering 48, no. 2 (November 14, 2019): 196–202. http://dx.doi.org/10.3311/pptr.12466.
Повний текст джерелаАнотація:
The results of comparative design research in the thermal stress and strain state of the piston in transport diesel engine 2 F 10.5/12 are given for its rated power operation. The standard piston is made of an aluminium alloy, and the modernized one, of steel. Piston thermal profiling and indicator test results were used for identifying the mathematical models and refining the boundary conditions for mechanics and heat conduction problems. To ensure reliable heat rejection from the piston, the paper considered the case of oil jet cooling. This was taken into account when describing the boundary conditions of the heat conduction problem. The thin-wall steel piston with oil jet cooling was shown to function reliably under the study conditions. The temperature in the first compression ring groove does not exceed 200 °С, and the radial deformation of the piston crown is less than half of that of an aluminium alloy standard piston.
7
Wu, Ji, Shu Lin Duan, Zhan Hua Wu, Li Dui Wei, and Hui Xing. "Coupled Heat Transfer Analysis of Piston Crown, Piston Rings and Cylinder Liner." Advanced Materials Research 614-615 (December 2012): 204–7. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.204.
Повний текст джерелаАнотація:
MAN Diesel’s 6S50MC-C disel is a two-stroke marine diesel engine. As the boundary conditions of temperature field distribution, the mean temperature and mean heat transfer coefficient are calculated firstly. The coupled heat transfer of piston crown, piston rings and cylinder liner are analyzed. The steady temperature field and the transient heat transfer under starting condition of diesel engine are obtained in ANSYS. Maximum temperature is 413.55°C in the top surface edge of the piston crown. 59.5% of the total heat from high-temperature fuel gas heat is absorbed by the cooling oil. The temperature of piston crown is effectively reduced by shaker cooling. The load of diesel engine should be increased slowly to prevent stress concentration. To reduce the destructive effect, enhancing cooling and warming up the main engine are requested.
8
Liu, Shi Ying, Xiao Qing Tian, Xu Dong Zhao, and Zeng Jian Feng. "Development of Piston Salt Core for the High Duty Engines." Advanced Materials Research 146-147 (October 2010): 556–59. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.556.
Повний текст джерелаАнотація:
New salt core technique for using in the high duty internal combustion engine piston under high pressure cast was developed.With special additional ceramic, the salt core’s compressive strength and the density performance were improved. Granulation technique could refine the grain microstructure. Orthogonal experiments were adopted for getting the process parameters, in this way, oil cooling gallery can be formed completely by the new technology. The new progress has been widely used by the high duty pistons.
9
JASKIERNIK, Maciej, Konrad BUCZEK, and Jędrzej WALKOWIAK. "Simulation of the oil supply through the connecting rod to the piston cooling channels in medium speed engines." Combustion Engines 180, no. 1 (March 30, 2020): 25–30. http://dx.doi.org/10.19206/ce-2020-104.
Повний текст джерелаАнотація:
The importance of the oil flow simulation in connecting rod oil channels during the engine development process is recently increasing. This can be observed either in medium speed engines, where, as one of the traditional solutions, the oil for piston cooling is supplied through the connecting rod, or in automotive engine VCR (variable compression ratio) connecting rods, where engine oil is used to change the compression ratio of the engine. In both cases, precise numerical results are necessary to shorten the prototyping period and to reduce the overall development cost. The multi-physics character of the simulation problem basically consists of the interaction between the dynamics of the crank train components and the oil flow. For the oil supply to the piston cooling channels through the connecting rod in medium speed engines, being the objective of this paper, a major influencing factor is the oil pressure behavior in the piston cooling gallery providing periodical interaction with its supply. At the same time, the connecting rod elastic deformation during engine operation can be regarded as negligible and the planar motion of the connecting rod can be reproduced by combination of translational and rotational acceleration fields in the CFD solver. The paper includes the description of the applied simulation approach, the results and a comparison with the state-of-the art calculation without consideration of the above-mentioned influencing factors.
10
Cho, Hoon, and Michiel van Nieuwstadt. "Piston temperature model oriented to control applications in diesel engines." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 232, no. 11 (November 11, 2017): 1562–70. http://dx.doi.org/10.1177/0954407017731680.
Повний текст джерелаАнотація:
In this paper, the development of a control-oriented piston temperature model for diesel engines is discussed. Using the underlying energy balance at the piston, a one-state piston temperature model was developed based on a thermal resistance concept. The model is composed of five sub-models: an engine model, a heat distribution model, a piston temperature model, an initial piston temperature model, and a maximum piston temperature model. In the engine model, the combustion heat transferred to the engine is calculated based on the energy balance in the cylinder chamber. The heat distribution model, which is a main feature in this model, determines the heat transferred to the piston using two maps as a function of engine speed and fuel depending on the piston cooling jet (PCJ) operation. The energy balance at the piston is applied to calculate the mean piston temperature, and the initial piston temperature is determined by the arbitration between the piston and the oil temperatures. The maximum piston temperature is estimated using a simple linear correction to the mean piston temperature. Integrating all sub-models in the Simulink platform, the model was identified and validated using piston temperature measurements under steady-state fuel steps as well as transient tests. There is a good agreement between the modeled and the measured piston temperatures with less than 4.1°C of root-mean-square-error (RMSE) over transient emissions cycles (FTP-75, LA92, and HWEFT). The modeled piston temperature can be used as an input to the control strategy of variable cooling devices, such as a variable displacement oil pump.
Дисертації з теми "Piston oil cooling"
1
Ting, Yew Siang. "A study of upward oil jet impingement on flat and concave heated surfaces and the application to IC engine piston cooling." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/19451.
Повний текст джерелаАнотація:
This thesis presents research on upward pointing oil jets that provide cooling of downward facing heated surfaces. The specific purpose of this research is to improve understanding of the oil jet cooling of internal combustion engine pistons. In this research, the cooling of heated blocks with flat and concave surfaces was investigated. Temperature measurements were obtained using an array of thermocouples embedded inside the heated blocks. A flash illumination and high resolution CCD camera system was used to observe the liquid jet impingement. Observations identified a 'bell-sheet' flow pattern, jet interference, jet splatter and jet breakup which provided insights into the liquid jet impingement processes normally encountered on downwardfacing surfaces. Bespoke contracting-type nozzles were used to produce the jet flow structure. The data from these nozzles were used to generate new empirical correlations for oil jet cooling of downward-facing flat surfaces and for predicting the size 6f impingement. The results obtained from these tests were also used for comparison with cooling jets from production automotive piston cooling nozzles. The research has demonstrated that the effectiveness of oil jet cooling can be affected by preheating the oil and varying the injector size to alter the targeted cooling efficiency, and liquid loss due to jet breakup and splatter. Local heat transfer coefficients were observed to increase when the jet Reynolds number increased. Piston undercrown cooling was studied using a range of oil jet configurations. The cooling rates improved with optimised targeted jets. The results also indicated that the undercrown geometry designs such as crosshatched surfaces, undercrown-skirt and gudgeon-pin boss, were significant for enhancing the local rate of forced convective heat transfer. New empirical correlations were developed from the experimental results that enabled prediction of the heat transfer coefficient and jet impingement size for high Prandtl number liquid jets impinging onto downward-facing surfaces. The heat transfer correlations were developed for normal (θ = 90°) and inclined (θ = 75°, 60° and 45°) jet impingements.
2
Lahr, Jens. "Experimental and computational analysis of oil flow in cooling galleries of diesel engine pistons." Thesis, Birmingham City University, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705651.
Повний текст джерелаАнотація:
This thesis describes in details the experimental and numerical investigations conducted to determine the filling and flow behaviour inside dynamic operating piston cooling galleries. An experimental test rig was built to replicate the reciprocating motion of internal combus- tion engine pistons to allow for varying engine speed, stroke length, oil flow rate and piston size. Two transparent models were produced, representing cooling galleries for small sized engine pistons found in passenger vehicles and large sized engine pistons found in heavy goods vehicles and earth moving equipment. High speed image processing was undertake to capture the flow behaviour inside the galleries during the piston cycle. An oil mixture was used to replicate the properties of engine oil at engine operating conditions. The flow inside the gallery was recorded from various view positions to capture the flow throughout the gallery. The flow domains representing the investigated gallery shapes were generated and computational fluid dynamic (CFD) studies of the two-phase flow behaviour were performed. The studies of gallery filling and in-gallery flow behaviour were undertaken for the same parametric conditions as defined in the experiments. The flow behaviour and filling of both studies, experimental and numerical, are compared and discussed. The results of the experimental and numerical studies compared well in terms of the identified directions of the main bulk oil flow within the small and large gallery and for the investigated crank speed and flow rate conditions. Both galleries showed that the flow in the gallery from inlet to outlet was mainly driven by the oil jet entering the gallery. The continuous entering jet forced a flow of the oil into the gallery branches. Strong turbulence in the direct vicinity of the inlet occurred as air and oil mixing was significant. It was found that the size of the turbulence region depended on the flow rate and engine speed, as well as the direction of movement of the gallery. It also sustained the presence of a large amount of medium-sized air bubbles due to mixing effects. Although the CFD did not predict the fine detail of the turbulent mixing, it did capture the underlying main flow characteristics, including short circuiting at the inlet. In the mid-gallery section the formation of large air bubbles took place, which could span across the gallery height. The flow behaviour was still driven by the inflow, but also controlled by the gallery cross-sectional shape. At the gallery outlet the flow was predominantly inertia driven as a result of the gallery movement with the oil exiting mainly during the upward stroke, allowing formation of large air bubbles. Distinctly different flows were encountered within the large and small gallery. The large gallery volume showed more unstructured or chaotic flow behaviour, especially in the mid- gallery section, as a result of the complex cross-sectional shape. In the small gallery volume the bulk flow was more controlled and wall-guided due to the limited space and regular cross-sectional shape. It was also found that the overall gallery filling for both galleries varied only by approximately 2% during the crank cycle. In contrast the variation of gallery section fillings of up to 30% and 50% for the large and small gallery respectively were determined, highlighting the effects of air movement within the galleries. The experimental results showed that an increase in flow rate, reflected by an increase in jet exit velocity, led to strong air entrainment of micro-scale bubbles into the oil clearly visible inside the gallery, while an increase in engine speed led to significantly lower formation of micro-scale air bubbles in the gallery. In contrast the CFD struggled to capture such fine details, unless the mesh density reached a very fine level, resulting in unsustainably long simulation times.
3
Клименко, Олександр Миколайович. "Оцінка впливу регулювання температурного стану поршнів на техніко-економічні показники дизеля". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21635.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук зі спеціальності 05.05.03 – двигуни та енергетичні установки. – Національний технічний університет "Харківський політехнічний інститут". – Харків, 2016.
Дисертаційна робота присвячена дослідженню впливу регульованого температурного стану поршнів дизеля різного призначення на його техніко-економічні показники. Розроблено та реалізовано методику оцінки якості дизеля при регулюванні інтенсивності масляного охолодження поршнів та керуванні моментом початку впорскування палива в камеру згоряння, а також при врахуванні моделі експлуатації енергетичної установки. Проведено експериментальні дослідження впливу температурного стану поршнів з низькотеплопровідним покриттям поверхні камери згоряння транспортного дизеля, а також зміни кута випередження впорскування палива на показники токсичності відпрацьованих газів, паливної економічності та температурний стан деталей камери згоряння. В результаті виконаного оптимізаційного дослідження запропоновано характеристичні карти керування масляним охолодженням поршнів та моментом початку впорскування палива для комплексного покращення техніко-економічних показників дизеля. Оцінено ефективність впровадження запропонованих заходів в автомобільних та тракторних дизелях та стаціонарних дизельгенераторах. Запропоновано методику врахування температурного стану найбільш теплонавантажених зон поршня в загальній методиці оцінки якості дизеля. Проведені розрахункові дослідження дозволили визначити ефективність регулювання температурного стану поршнів на ресурсну міцність його камери згоряння.Thesis for the science degree of the Candidate of technical sciences by speciality 05.05.03 – engines and power plants. – National Technical University "Kharkоv polytechnic institute", Kharkоv, 2016. Dissertation is devoted to research of complex influence of pistons temperature state regulation on the diesel engine technical and economic performance. In the dissertation work a method of estimating the quality of the diesel engine when regulating of the pistons temperature state, which takes into account indicators of exhaust gases toxicity and ICE fuel efficiency in each mode of the power plant operation is proposed. Experimental study of the effect of temperature condition of pistons with low conductive coating combustion chamber surface and changes the fuel injection timing angle on the exhaust gases toxicity, fuel economy and thermal condition of combustion chamber parts is done. As a result of the optimization research the characteristic cards control of pistons oilcooling and the fuel injection start for complex diesel engine technical and economic indicators improvement are proposed, the effectiveness of their use in automobile and tractor diesel engines and stationary diesel generators are estimated. The method of accounting of the most heat-loaded piston zones temperature state in general procedure of diesel quality assessment is proposed. Conducted estimated researches have allowed to define the effectiveness of pistons temperature state regulation on the combustion chamber resource strength.
4
Клименко, Олександр Миколайович. "Оцінка впливу регулювання температурного стану поршнів на техніко-економічні показники дизеля". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21632.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук зі спеціальності 05.05.03 – двигуни та енергетичні установки. – Національний технічний університет "Харківський політехнічний інститут". – Харків, 2016.
Дисертаційна робота присвячена дослідженню впливу регульованого температурного стану поршнів дизеля різного призначення на його техніко-економічні показники. Розроблено та реалізовано методику оцінки якості дизеля при регулюванні інтенсивності масляного охолодження поршнів та керуванні моментом початку впорскування палива в камеру згоряння, а також при врахуванні моделі експлуатації енергетичної установки. Проведено експериментальні дослідження впливу температурного стану поршнів з низькотеплопровідним покриттям поверхні камери згоряння транспортного дизеля, а також зміни кута випередження впорскування палива на показники токсичності відпрацьованих газів, паливної економічності та температурний стан деталей камери згоряння. В результаті виконаного оптимізаційного дослідження запропоновано характеристичні карти керування масляним охолодженням поршнів та моментом початку впорскування палива для комплексного покращення техніко-економічних показників дизеля. Оцінено ефективність впровадження запропонованих заходів в автомобільних та тракторних дизелях та стаціонарних дизельгенераторах. Запропоновано методику врахування температурного стану найбільш теплонавантажених зон поршня в загальній методиці оцінки якості дизеля. Проведені розрахункові дослідження дозволили визначити ефективність регулювання температурного стану поршнів на ресурсну міцність його камери згоряння.Thesis for the science degree of the Candidate of technical sciences by speciality 05.05.03 – engines and power plants. – National Technical University "Kharkоv polytechnic institute", Kharkоv, 2016. Dissertation is devoted to research of complex influence of pistons temperature state regulation on the diesel engine technical and economic performance. In the dissertation work a method of estimating the quality of the diesel engine when regulating of the pistons temperature state, which takes into account indicators of exhaust gases toxicity and ICE fuel efficiency in each mode of the power plant operation is proposed. Experimental study of the effect of temperature condition of pistons with low conductive coating combustion chamber surface and changes the fuel injection timing angle on the exhaust gases toxicity, fuel economy and thermal condition of combustion chamber parts is done. As a result of the optimization research the characteristic cards control of pistons oilcooling and the fuel injection start for complex diesel engine technical and economic indicators improvement are proposed, the effectiveness of their use in automobile and tractor diesel engines and stationary diesel generators are estimated. The method of accounting of the most heat-loaded piston zones temperature state in general procedure of diesel quality assessment is proposed. Conducted estimated researches have allowed to define the effectiveness of pistons temperature state regulation on the combustion chamber resource strength.
Частини книг з теми "Piston oil cooling"
1
Wang, Peng, Jizu Lv, Minli Bai, Chengzhi Hu, Liang Zhang, and Hao Liu. "Numerical Investigation into the Cooling Process of Conventional Engine Oil and Nano-Oil Inside the Piston Gallery." In Lecture Notes in Electrical Engineering, 1151–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33750-5_26.
Повний текст джерела
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Hrdina, Daniel, Weiping Yang, Geno Marinov, and Adam Loch. "Flow-optimized cooling gallery concept for laser welded steel pistons to enable reduction of oil flow." In Proceedings, 239–58. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-25889-4_15.
Повний текст джерелаТези доповідей конференцій з теми "Piston oil cooling"
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Hopf, Anselm, Frank Kraemer, Paul Turner cEng, and Carsten Weber. "CFD Simulation of Oil Jet Piston Cooling Applied to Pistons with Cooling Gallery." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2022. http://dx.doi.org/10.4271/2022-01-0210.
Повний текст джерела
2
Varghese, Mani Bijoy, and Avinash Kumar Agarwal. "Numerical Investigations Of Piston Cooling Using Oil Jet." In SIAT 2004. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-28-0061.
Повний текст джерела
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Chen, Yu, and Shashank Moghe. "Heavy Duty Engine Piston Cooling Gallery Oil Filling Ratio Measurement and Comparison of Results With Simulation." In ASME 2018 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icef2018-9582.
Повний текст джерелаАнотація:
Pistons for heavy duty diesel applications endure high thermal loads and therefore result in reduced durability. Pistons for such heavy duty applications are generally designed with an internal oil gallery — called the piston cooling gallery (PCG) — where the intent is to reduce the piston crown temperatures through forced convection cooling and thereby ensure the durability of the piston. One of the key factors influencing the efficiency of such a heat-transfer process is the volume fraction of oil inside the piston cooling gallery — defined as the filling ratio (FR) — during engine operation. As a part of this study, a motoring engine measurement system was developed to measure the piston filling ratio of an inline-6 production heavy duty engine. In this system, multiple high precision pressure sensors were applied to the piston cooling gallery and a linkage was designed and fabricated to transfer the piston cooling gallery oil pressure signal out of the motoring engine. This pressure information was then correlated with the oil filling ratio through a series of calibration runs with known oil quantity in the piston cooling gallery. This proposed method can be used to measure the piston cooling gallery oil filling ratio for heavy duty engine pistons. A preliminary transient Computational Fluid Dynamics (CFD) analysis was performed to identify the filling ratio and transient pressures at the corresponding transducer locations in the piston cooling gallery for one of the motoring test operating speeds (1200 RPM). A mesh dependency study was performed for the CFD analysis and the results were compared against those from the motoring test.
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Izadi, Mohamad, Seyed Vahid Hosseini, Seyed Shahab Alaviyoun, and Seyed Mostafa Agha Mirsalim. "Experimental and Numerical Analysis of the Piston Cooling Jet’s Performance." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25145.
Повний текст джерелаАнотація:
Recently, with development in the output power and material cost efficiency, the value of thermal and mechanical stress on many engine parts such as piston is increased. On the other hands, the strength of aluminum alloys used for piston manufacturing decreases with temperature. So, for lightweight pistons, the strength reduction should be minimized to maintain the mechanical integrity of the part. This drives piston designers to use strong and lightweight materials that can sustain a harsh thermal environment through improved oil cooling. In addition to modify the power output, piston cooling reduces the carbonization and pre-ignition caused by hot spots on sharp edges of the piston crown. In this study, in order to evaluate the piston cooling functionality and validate the numerical simulation, a test rig is designed and manufactured and it is equipped with glassy piston and cylinder to show the oil contact surface. Using this test rig, flow rate is measured in different oil pressures and temperatures. In addition, heat transfer coefficient for various engine speeds is determined. Also a numerical model has been developed using CFD approach for analysis of piston cooling oil jet and validated with existing experimental results at axisymmetric condition. Finally, oil contact area and heat transfer coefficient are predicted at the bottom of piston for real piston cooling jet conditions.
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Mikhaylov, Yury V., Leonid L. Myagkov, and Nikolay S. Malastowski. "Numerical Simulation of Impinging Jet Cooling." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22654.
Повний текст джерелаАнотація:
This paper presents a technique for heat transfer prediction of impinging jet cooling of internal combustion engine piston based on numerical simulation in ANSYS CFX. This technique implies the simulation of the hydrodynamics of the interaction between cooling oil jet and moving piston. The following steps were made in the stage of verification: the results of oil flow simulation in open channel were compared with corresponding experimental data; the interaction between the oil jet and piston underside was simulated and the results were qualitatively compared with the shots obtained in experimental study by means of hi-speed photography; the quantitative estimation of heat transfer computation results is made by comparing obtained temperature values with experimental data and shows satisfactory results agreement. The comparison of the piston temperature fields shows the efficiency of using impinging jet for piston cooling. In conclusion the further development trends of presented technique were suggested.
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Morris, Andrew, and Daniel Christopher Bitsis. "Reduced Piston Oil Cooling for Improved Heavy-Duty Vehicle Fuel Economy." In SAE WCX Digital Summit. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2021. http://dx.doi.org/10.4271/2021-01-0387.
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Goyal, Sandeep Kumar, and Avinash Kumar Agarwal. "Experimental and Numerical Investigations of Jet Impingement Cooling of Flat Plate for Controlling the Non-Tail Pipe Emissions From Heavy Duty Diesel Engines." In ASME 2006 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ices2006-1434.
Повний текст джерелаАнотація:
The continuous increase in power density has led to higher thermal loading of pistons of heavy duty diesel engines. Material constraints restrict the maximum operating temperature of a piston. High piston temperature rise may lead to engine seizure because of piston warping. To avoid this, pistons are usually cooled by oil jet impingement from the underside of the piston in heavy duty diesel engines. Impingement heat transfer has been used extensively because of the high rates of cooling it provides. The associated high heat transfer rate is due to the oil jet that impacts hot impingement surface at high speed. However, if the temperature at the underside of the piston, where the oil jet strikes the piston, is above the boiling point of the oil, it may contribute to the mist generation. This mist significantly contributes to non tail-pipe emission (non-point source) in the form of unburnt hydrocarbons (UBHC’s). This paper presents and discusses the results of a numerical and experimental investigation of the heat transfer between a constant heat flux flat plate and an impinging oil jet. Piston boundary conditions are applied to the flat plate. Using the numerical modeling, heat transfer coefficient (h) at the underside of the piston is calculated. This predicted value of heat transfer coefficient significantly helps in selecting right oil grade, oil jet velocity, nozzle diameter and distance of the nozzle from the underside of the piston. It also helps to predict whether the selected grade of oil will contribute to mist generation. Using numerical simulation (finite element method) temperature profiles are evaluated by varying heat flux. Infrared camera is used to investigate and validate the temperature profile of the flat plate. High speed camera is used to capture the mist generation and oil jet breakup due to impinging jet.
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Vignesh, C., C. Jebaraj, S. Manivasagam, R. Mahadevan, and K. Srinivasan. "Prediction of Heat Flow and Temperature for Pistons With Improved Cooling Methods." In ASME 2005 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/icef2005-1313.
Повний текст джерелаАнотація:
This study deals with the prediction of the heat flow and temperature of an IC engine piston having different types of cooling methods. This decade has seen a very significant increase in the load rating of the internal combustion engines. There is a marked shift in the current engines from the conventional NA (Naturally Aspirated) engines. The presence of turbo chargers and super chargers has improved the power output by more than two times. The engines develop a pressure upto 180 bar and release very high heat energy. This has resulted in a piston crown temperature to the tune of 350 Deg. Centigrade. The increase in temperature will have a very serious effect on the lubricating oil, as at elevated temperature oil will have greatly reduced viscosity. Therefore, it is essential to bring the temperature down by having a proper cooling arrangement for the piston system. Two design options of cooling the piston are studied in this paper. In the first option piston is cooled by forcing a jet of oil towards the under-crown portion of the piston. The second option is having a cavity popularly known as cooling gallery, through which the jet of oil is allowed to circulate. The predictive study is carried out by using Finite Element Analysis Techniques. The numerical results obtained for the two options are compared with the base line configuration and the effects of the modifications are discussed in detail. In addition transient thermal analysis is done to predict the transient thermal hoop stress developed in the piston bowl. Since transient hoop stress is the main cause for fatigue failure of the piston bowl, a parametric study is carried out to study the effect of cooling methods on thermal hoop stress.
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Moghe, Shashank S., and Scott M. Janowiak. "Large Eddy Simulation of Cylindrical Jet Break-Up and Correlation of Simulation Results With Experimental Data." In ASME 2016 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icef2016-9340.
Повний текст джерелаАнотація:
Modern engines with increasing power densities have put additional demands on pistons to perform in incrementally challenging thermal environments. Piston cooling is therefore of paramount importance for engine component manufacturers. The objective of this CFD study is to identify the effect of a given piston cooling nozzle (PCN) geometry on the cooling oil jet fanning (spreading) phenomenon. The scope of this study is to develop a numerical set-up using the open-source CFD tool OpenFOAM® for measuring the magnitude of oil jet fanning and comparing it to experimental results. Large eddy simulation (LES) turbulence modeling is used to capture the flow physics that strongly affects the inherently unsteady jet break-up phenomenon. The oil jet fanning width is the primary metric used for comparing the numerical and experimental results. The results of simulation are validated for the correct applicability of LES by evaluating the quality metric (according to Pope [1]) at various probe locations and also by performing turbulent kinetic energy (TKE) spectral analysis. CFD results appear promising since they correspond to the experimental data within a tolerance (of ±10%) deemed satisfactory for the purpose of this study. Further generalization of the set-up is underway, towards developing a tool that predicts the aforementioned metric — thereby evaluating the effect of nozzle geometry on jet fanning and hence on the oil catching efficiency (CE) of the piston cooling gallery. Such a tool would act as an intermediate step in defining the boundary conditions for determining the filling ratio (FR) and subsequently the heat transfer coefficients (HTCs) in the piston cooling gallery.
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El-Khawankey, Sarah, Faruk Al-Sibai, and Reinhold Kneer. "Impinging Oil Jet Behaviour for Planar Wall Heat Transfer." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22805.
Повний текст джерелаАнотація:
Impinging jets for convective cooling are used in several technical applications. Piston cooling with impinging oil jets is one key application. To improve the heat transfer between the surface of the piston and the oil film it is necessary to understand the underlying mechanisms of heat transfer at the boundary face. For this reason it is important to analyze the oil flow and to identify and evaluate the influence of the parameters governing film formation. Also the oil jet is investigated, because the film formation can be influenced by the jet. In the experiments the oil temperature is set to 30 °C or 60 °C and the pressure at the nozzle inlet is varied between 1.6 bar and 4.2 bar. The minimal Reynolds number is 125 and the maximum is 1924. The liquid Weber number varies between 2.2 × 10−2 and 52.9 × 10−2. The results of the visualization measurements reveal the influence of the exit velocity, oil temperature and the related material properties on the film formation process. On the one hand the results show the macroscopic relation between Reynolds number and the level of instability. On the other hand the relation between Weber number and the break-up at the surface of the jet and accordingly of the film surface can be demonstrated.
Звіти організацій з теми "Piston oil cooling"
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Takeuchi, Yoshitaka, Kenta Akimoto, Takashi Noda, Yu Nozawa, and Tomohisa Yamada. Development of Techniques for Improving Piston Cooling Performance (Second Report)~Oil Movement and Heat Transfer Simulation in Piston Cooling Channel With CFD. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0373.
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Nozawa, Yu, Takashi Noda, Tomohisa Yamada, Yoshitaka Takeuchi, and Kenta Akimoto. Development of Techniques for Improving Piston Cooling Performance (First Report)~Measurement of Heat Absorption Characteristics by Engine Oil in Cooling Channel. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0372.
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